When you get to a transition point where you are showing two video clips you are now decoding multiple video streams simultaneously. So it sounds like your computer is able to keep up with the decoding (playback) of one stream, but not two (although this doesn't necessarily apply to a dissolve to white/black.)
Definitely check out the renderer situation as already posted about, especially given the dip to white issue, but a couple of considerations when it comes to multiple video streams:
- Bitrate & Drive Speed: Depending on the speed of your drives and the bitrate of your media you could be saturating the I/O bandwidth when trying to pipe through multiple videos simultaneously.
- Video Codec: Difficult to decode video codecs like H264 or H265 will make pretty much everything slow down. This is a situation where your computer could be maybe keeping up with one, but two becomes too much to handle (this isn't an insult to your hardware, and hardware is only half the battle anyway. This is just how these video codecs work.) So, anything coming on top of a poor editing codec will suffer: multiple streams, VFX, color correction, etc. It's all made more difficult because the codec requires extra processing to "figure out," before the computer can move on to processing the effects.
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